Remove #pragma once from ash

ash/wm/window_resizer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_WM_WINDOW_RESIZER_H_
 #define ASH_WM_WINDOW_RESIZER_H_
-#pragma once
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ash {
@@ skipping 105 matching lines @@
   // Returns the height of the drag.
   static int GetHeightForDrag(const Details& details,
                               int min_height,
                               int* delta_y,
                               int grid_size);
 };
 
 }  // namespace aura
 
 #endif  // ASH_WM_WINDOW_RESIZER_H_